Call functions on elements of list

Question

In python I am working with a function that takes for instance 3 parameters (actually these functions are being generated on the fly and can have a varying number of parameters) I also have a list containing the arguments I want to use for those parameters. Is there a way to extract the arguments from the list and pass them to the function? I am using a library and so cannot rewrite the functions to use lists instead of individual parameters.

def f(a, b, c):
    # do stuff with a, b, and c

x = [4, 6, 10]

#####
# How do I call f and pass in the elements of x in order?
# i.e. I want to call f(4, 6, 10) without doing f(x[0], x[1], x[2])
#####

user3483203 · Accepted Answer · 2018-03-30T05:43:45.937

3

You can use * to unpack the values in your list as parameters of your function:

def f(a, b, c):
    print(a,b,c)

x = [4, 6, 10]

f(*x)

Output:

4 6 10

Just be careful that your list has the proper number of parameters.

edited Mar 30 '18 at 05:43

answered Mar 30 '18 at 05:41

user3483203

50,081
9
65
94

ooh that's cool. anything else `*x` is useful for? – Psyche Mar 30 '18 at 05:41
1

@Psyche https://stackoverflow.com/questions/36901/what-does-double-star-asterisk-and-star-asterisk-do-for-parameters – Keyur Potdar Mar 30 '18 at 05:42

Call functions on elements of list

1 Answers1